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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 19:27:15 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:15 +0200 |
| commit | 35c7422649ee7a3d0eb4ebd32c997eeb45f81046 (patch) | |
| tree | 8baebdb9aeb46844c7e9becc5a7699c47257f86d /arch/x86_64 | |
| parent | 4cdd9c8931767e1c56a51a1078d33a8c340f4405 (diff) | |
| download | op-kernel-dev-35c7422649ee7a3d0eb4ebd32c997eeb45f81046.zip op-kernel-dev-35c7422649ee7a3d0eb4ebd32c997eeb45f81046.tar.gz | |
[PATCH] x86: deflate stack usage in lib/inflate.c
inflate_fixed and huft_build together use around 2.7k of stack. When
using 4k stacks, I saw stack overflows from interrupts arriving while
unpacking the root initrd:
do_IRQ: stack overflow: 384
[<c0106b64>] show_trace_log_lvl+0x1a/0x30
[<c01075e6>] show_trace+0x12/0x14
[<c010763f>] dump_stack+0x16/0x18
[<c0107ca4>] do_IRQ+0x6d/0xd9
[<c010202b>] xen_evtchn_do_upcall+0x6e/0xa2
[<c0106781>] xen_hypervisor_callback+0x25/0x2c
[<c010116c>] xen_restore_fl+0x27/0x29
[<c0330f63>] _spin_unlock_irqrestore+0x4a/0x50
[<c0117aab>] change_page_attr+0x577/0x584
[<c0117b45>] kernel_map_pages+0x8d/0xb4
[<c016a314>] cache_alloc_refill+0x53f/0x632
[<c016a6c2>] __kmalloc+0xc1/0x10d
[<c0463d34>] malloc+0x10/0x12
[<c04641c1>] huft_build+0x2a7/0x5fa
[<c04645a5>] inflate_fixed+0x91/0x136
[<c04657e2>] unpack_to_rootfs+0x5f2/0x8c1
[<c0465acf>] populate_rootfs+0x1e/0xe4
(This was under Xen, but there's no reason it couldn't happen on bare
hardware.)
This patch mallocs the local variables, thereby reducing the stack
usage to sane levels.
Also, up the heap size for the kernel decompressor to deal with the
extra allocation.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Tim Yamin <plasmaroo@gentoo.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/boot/compressed/misc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86_64/boot/compressed/misc.c b/arch/x86_64/boot/compressed/misc.c index fed1167..f932b0e 100644 --- a/arch/x86_64/boot/compressed/misc.c +++ b/arch/x86_64/boot/compressed/misc.c @@ -189,7 +189,7 @@ static void putstr(const char *); static long free_mem_ptr; static long free_mem_end_ptr; -#define HEAP_SIZE 0x6000 +#define HEAP_SIZE 0x7000 static char *vidmem = (char *)0xb8000; static int vidport; |
