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authorAndi Kleen <ak@suse.de>2005-04-16 15:25:10 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:25:10 -0700
commitf0de53bbc2118c754ee923516122d91add288582 (patch)
tree3bb61f6e6d4e789c516c7ffb125ac89982d9a10c
parent94ad84740fb3fe6c2112e60bc71a256c2815479d (diff)
[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.c8
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;
}