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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-11-11 20:30:15 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-11-11 20:30:15 +0100 |
| commit | 961767b75d63c21aa60ee3ccf940288c3c1afde6 (patch) | |
| tree | 2ba45f33bcd7998fd52a1f423e76265370953054 /mm | |
| parent | Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kern... (diff) | |
| parent | highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NM... (diff) | |
| download | linux-961767b75d63c21aa60ee3ccf940288c3c1afde6.tar.xz linux-961767b75d63c21aa60ee3ccf940288c3c1afde6.zip | |
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE
highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow
rcu: Fix long-grace-period race between forcing and initialization
uids: Prevent tear down race
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/highmem.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/mm/highmem.c b/mm/highmem.c index 25878cc49daa..9c1e627f282e 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -426,16 +426,21 @@ void __init page_address_init(void) void debug_kmap_atomic(enum km_type type) { - static unsigned warn_count = 10; + static int warn_count = 10; - if (unlikely(warn_count == 0)) + if (unlikely(warn_count < 0)) return; if (unlikely(in_interrupt())) { - if (in_irq()) { + if (in_nmi()) { + if (type != KM_NMI && type != KM_NMI_PTE) { + WARN_ON(1); + warn_count--; + } + } else if (in_irq()) { if (type != KM_IRQ0 && type != KM_IRQ1 && type != KM_BIO_SRC_IRQ && type != KM_BIO_DST_IRQ && - type != KM_BOUNCE_READ) { + type != KM_BOUNCE_READ && type != KM_IRQ_PTE) { WARN_ON(1); warn_count--; } @@ -452,7 +457,9 @@ void debug_kmap_atomic(enum km_type type) } if (type == KM_IRQ0 || type == KM_IRQ1 || type == KM_BOUNCE_READ || - type == KM_BIO_SRC_IRQ || type == KM_BIO_DST_IRQ) { + type == KM_BIO_SRC_IRQ || type == KM_BIO_DST_IRQ || + type == KM_IRQ_PTE || type == KM_NMI || + type == KM_NMI_PTE ) { if (!irqs_disabled()) { WARN_ON(1); warn_count--; |