From 5a0e3ad6af8660be21ca98a971cd00f331318c05 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 24 Mar 2010 17:04:11 +0900 Subject: include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo Guess-its-ok-by: Christoph Lameter Cc: Ingo Molnar Cc: Lee Schermerhorn --- arch/s390/kernel/compat_linux.c | 2 +- arch/s390/kernel/ipl.c | 1 + arch/s390/kernel/kprobes.c | 1 + arch/s390/kernel/process.c | 2 +- arch/s390/kernel/setup.c | 1 - arch/s390/kernel/smp.c | 1 + arch/s390/kernel/sysinfo.c | 1 + arch/s390/kernel/time.c | 1 + 8 files changed, 7 insertions(+), 3 deletions(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c index 11c3aba..73b624e 100644 --- a/arch/s390/kernel/compat_linux.c +++ b/arch/s390/kernel/compat_linux.c @@ -29,7 +29,6 @@ #include #include #include -#include #include #include #include @@ -52,6 +51,7 @@ #include #include #include +#include #include #include diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 7eedbbc..72c8b0d 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index 86783ef..3d34eef 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -29,6 +29,7 @@ #include #include #include +#include DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 00b6d1d..1039fde 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -16,9 +16,9 @@ #include #include #include +#include #include #include -#include #include #include #include diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index ba363d9..91625f7 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -25,7 +25,6 @@ #include #include #include -#include #include #include #include diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index d7d24fc..e4d98de 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/s390/kernel/sysinfo.c b/arch/s390/kernel/sysinfo.c index b5e75e1..a0ffc771 100644 --- a/arch/s390/kernel/sysinfo.c +++ b/arch/s390/kernel/sysinfo.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index aa2483e..fba6dec 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include #include -- cgit v1.1 From d7015c120e0ac55d86cabbe7a14997b99f39e282 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 9 Apr 2010 13:42:58 +0200 Subject: [S390] arch/s390/kernel: Add missing unlock In the default case the lock is not unlocked. The return is converted to a goto, to share the unlock at the end of the function. A simplified version of the semantic patch that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @r exists@ expression E1; identifier f; @@ f (...) { <+... * spin_lock_irq (E1,...); ... when != E1 * return ...; ...+> } // Signed-off-by: Julia Lawall Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/topology.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index 14ef6f0..247b4c2 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -165,10 +165,11 @@ static void tl_to_cores(struct tl_info *info) default: clear_cores(); machine_has_topology = 0; - return; + goto out; } tle = next_tle(tle); } +out: spin_unlock_irq(&topology_lock); } -- cgit v1.1 From 176b1803ce4690d0dd94e16f118dbd14af045034 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 9 Apr 2010 13:43:00 +0200 Subject: [S390] fix io_return critical section cleanup If a machine check interrupts the io interrupt handler on one of the instructions between io_return and io_leave the critical section cleanup code will move the return psw to io_work_loop. By doing that the switch from the asynchronous interrupt stack to the process stack is skipped. If e.g. TIF_NEED_RESCHED is set things break because the scheduler is called with the asynchronous interrupts stack. Moving the psw back to io_return instead fixes the problem. Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/entry.S | 8 +++++++- arch/s390/kernel/entry64.S | 8 +++++++- 2 files changed, 14 insertions(+), 2 deletions(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 4348f9b..6af7045 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -964,7 +964,7 @@ cleanup_critical: clc 4(4,%r12),BASED(cleanup_table_io_work_loop) bl BASED(0f) clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4) - bl BASED(cleanup_io_return) + bl BASED(cleanup_io_work_loop) 0: br %r14 @@ -1039,6 +1039,12 @@ cleanup_sysc_leave_insn: cleanup_io_return: mvc __LC_RETURN_PSW(4),0(%r12) + mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_return) + la %r12,__LC_RETURN_PSW + br %r14 + +cleanup_io_work_loop: + mvc __LC_RETURN_PSW(4),0(%r12) mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop) la %r12,__LC_RETURN_PSW br %r14 diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 29fd0f1..52106d5 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -946,7 +946,7 @@ cleanup_critical: clc 8(8,%r12),BASED(cleanup_table_io_work_loop) jl 0f clc 8(8,%r12),BASED(cleanup_table_io_work_loop+8) - jl cleanup_io_return + jl cleanup_io_work_loop 0: br %r14 @@ -1021,6 +1021,12 @@ cleanup_sysc_leave_insn: cleanup_io_return: mvc __LC_RETURN_PSW(8),0(%r12) + mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_return) + la %r12,__LC_RETURN_PSW + br %r14 + +cleanup_io_work_loop: + mvc __LC_RETURN_PSW(8),0(%r12) mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop) la %r12,__LC_RETURN_PSW br %r14 -- cgit v1.1 From 187644636ea79aa4bdc04757ebca919c4fd546e0 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 9 Apr 2010 13:43:03 +0200 Subject: [S390] nss: add missing .previous statement to asm function The savesys_ipl_nss asm function is put into the .init.text section however it is missing a ".previous" section which would restore the previous section. Luckily all functions in early.c are init functions so it doesn't matter currently. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/early.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/s390/kernel') diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 31d618a..2d92c2c 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -82,7 +82,8 @@ asm( " lm 6,15,24(15)\n" #endif " br 14\n" - " .size savesys_ipl_nss, .-savesys_ipl_nss\n"); + " .size savesys_ipl_nss, .-savesys_ipl_nss\n" + " .previous\n"); static __initdata char upper_command_line[COMMAND_LINE_SIZE]; -- cgit v1.1