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sched_ext: Use kvzalloc for large exit_dump allocation

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Replace kzalloc with kvzalloc for the exit_dump buffer allocation, which
can require large contiguous memory depending on the implementation.
This change prevents allocation failures by allowing the system to fall
back to vmalloc when contiguous memory allocation fails.

Since this buffer is only used for debugging purposes, physical memory
contiguity is not required, making vmalloc a suitable alternative.

Cc: stable@vger.kernel.org
Fixes: 07814a9439 ("sched_ext: Print debug dump after an error exit")
Suggested-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Breno Leitao 2025-04-08 09:50:42 -07:00 committed by Tejun Heo
parent 4a1d8ababd
commit 47068309b5
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/ext.c
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@ -4623,7 +4623,7 @@ static void scx_ops_bypass(bool bypass)
static void free_exit_info(struct scx_exit_info *ei)
{
kfree(ei->dump);
kvfree(ei->dump);
kfree(ei->msg);
kfree(ei->bt);
kfree(ei);
@ -4639,7 +4639,7 @@ static struct scx_exit_info *alloc_exit_info(size_t exit_dump_len)
ei->bt = kcalloc(SCX_EXIT_BT_LEN, sizeof(ei->bt[0]), GFP_KERNEL);
ei->msg = kzalloc(SCX_EXIT_MSG_LEN, GFP_KERNEL);
ei->dump = kzalloc(exit_dump_len, GFP_KERNEL);
ei->dump = kvzalloc(exit_dump_len, GFP_KERNEL);
if (!ei->bt || !ei->msg || !ei->dump) {
free_exit_info(ei);