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| author | Andi Kleen <ak@suse.de> | 2005-04-16 15:25:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:25:10 -0700 |
| commit | f0de53bbc2118c754ee923516122d91add288582 (patch) | |
| tree | 3bb61f6e6d4e789c516c7ffb125ac89982d9a10c | |
| parent | 94ad84740fb3fe6c2112e60bc71a256c2815479d (diff) | |
| download | linux-3.10-f0de53bbc2118c754ee923516122d91add288582.tar.gz linux-3.10-f0de53bbc2118c754ee923516122d91add288582.tar.bz2 linux-3.10-f0de53bbc2118c754ee923516122d91add288582.zip | |
[PATCH] x86_64: Remove excessive stack allocation in MCE code with large NR_CPUS
Remove excessive stack allocation in MCE code with large NR_CPUS
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/mce.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c index 6ca066424de..3a89d735a4f 100644 --- a/arch/x86_64/kernel/mce.c +++ b/arch/x86_64/kernel/mce.c @@ -379,18 +379,23 @@ static void collect_tscs(void *data) static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff_t *off) { - unsigned long cpu_tsc[NR_CPUS]; + unsigned long *cpu_tsc; static DECLARE_MUTEX(mce_read_sem); unsigned next; char __user *buf = ubuf; int i, err; + cpu_tsc = kmalloc(NR_CPUS * sizeof(long), GFP_KERNEL); + if (!cpu_tsc) + return -ENOMEM; + down(&mce_read_sem); next = rcu_dereference(mcelog.next); /* Only supports full reads right now */ if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) { up(&mce_read_sem); + kfree(cpu_tsc); return -EINVAL; } @@ -421,6 +426,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff } } up(&mce_read_sem); + kfree(cpu_tsc); return err ? -EFAULT : buf - ubuf; } |