diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-24 12:33:58 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-24 12:33:58 -0700 |
commit | a141fd55f26231b5a17f74e504c56d44c3e62e5d (patch) | |
tree | 5859552ca39fec7b0808794889d03dff2106c145 /tools/objtool/Documentation/stack-validation.txt | |
parent | 16528a3fed5de9228de0dd7a9a4de3f3eb4c982a (diff) | |
parent | f5caf621ee357279e759c0911daf6d55c7d36f03 (diff) | |
download | op-kernel-dev-a141fd55f26231b5a17f74e504c56d44c3e62e5d.zip op-kernel-dev-a141fd55f26231b5a17f74e504c56d44c3e62e5d.tar.gz |
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"Another round of CR3/PCID related fixes (I think this addresses all
but one of the known problems with PCID support), an objtool fix plus
a Clang fix that (finally) solves all Clang quirks to build a bootable
x86 kernel as-is"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm: Fix inline asm call constraints for Clang
objtool: Handle another GCC stack pointer adjustment bug
x86/mm/32: Load a sane CR3 before cpu_init() on secondary CPUs
x86/mm/32: Move setup_clear_cpu_cap(X86_FEATURE_PCID) earlier
x86/mm/64: Stop using CR3.PCID == 0 in ASID-aware code
x86/mm: Factor out CR3-building code
Diffstat (limited to 'tools/objtool/Documentation/stack-validation.txt')
-rw-r--r-- | tools/objtool/Documentation/stack-validation.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/tools/objtool/Documentation/stack-validation.txt b/tools/objtool/Documentation/stack-validation.txt index 6a1af43..3995735 100644 --- a/tools/objtool/Documentation/stack-validation.txt +++ b/tools/objtool/Documentation/stack-validation.txt @@ -194,10 +194,10 @@ they mean, and suggestions for how to fix them. If it's a GCC-compiled .c file, the error may be because the function uses an inline asm() statement which has a "call" instruction. An asm() statement with a call instruction must declare the use of the - stack pointer in its output operand. For example, on x86_64: + stack pointer in its output operand. On x86_64, this means adding + the ASM_CALL_CONSTRAINT as an output constraint: - register void *__sp asm("rsp"); - asm volatile("call func" : "+r" (__sp)); + asm volatile("call func" : ASM_CALL_CONSTRAINT); Otherwise the stack frame may not get created before the call. |