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powerpc/crash: preserve user-specified memory limit

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Commit 59d58189f3 ("crash: fix crash memory reserve exceed system memory
bug") fails crashkernel parsing if the crash size is found to be higher
than system RAM, which makes the memory_limit adjustment code ineffective
due to an early exit from reserve_crashkernel().

Regardless lets not violate the user-specified memory limit by adjusting
it.  Remove this adjustment to ensure all reservations stay within the
limit.  Commit f94f5ac079 ("powerpc/fadump: Don't update the
user-specified memory limit") did the same for fadump.

Link: https://lkml.kernel.org/r/20250131113830.925179-6-sourabhjain@linux.ibm.com
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Cc: Baoquan he <bhe@redhat.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sourabh Jain
2025-01-31 17:08:28 +05:30
committed by Andrew Morton
parent 6e5250eaa6
commit 021b5b303c
1 changed files with 0 additions and 8 deletions
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8
arch/powerpc/kexec/core.c
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@@ -128,14 +128,6 @@ void __init reserve_crashkernel(void)
return;
}
/* Crash kernel trumps memory limit */
if (memory_limit && memory_limit <= crashk_res.end) {
memory_limit = crashk_res.end + 1;
total_mem_sz = memory_limit;
printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
memory_limit);
}
printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
"for crashkernel (System RAM: %ldMB)\n",
(unsigned long)(crash_size >> 20),