6.12-stable review patch. If anyone has any objections, please let me know.
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From: Breno Leitao leitao@debian.org
commit 47068309b5777313b6ac84a77d8d10dc7312260a upstream.
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: 07814a9439a3b0 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/sched/ext.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -4530,7 +4530,7 @@ unlock:
static void free_exit_info(struct scx_exit_info *ei) { - kfree(ei->dump); + kvfree(ei->dump); kfree(ei->msg); kfree(ei->bt); kfree(ei); @@ -4546,7 +4546,7 @@ static struct scx_exit_info *alloc_exit_
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);