* [PATCH] powerpc/kexec_file: Use inclusive range checks in add_usable_mem()
@ 2026-08-09 16:24 Thorsten Blum
0 siblings, 0 replies; only message in thread
From: Thorsten Blum @ 2026-08-09 16:24 UTC (permalink / raw)
To: Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Sourabh Jain, Hari Bathini,
Aditya Gupta, Jinjie Ruan, Thiago Jung Bauermann
Cc: Thorsten Blum, linuxppc-dev, linux-kernel
add_usable_mem() adds usable memory ranges for the kdump kernel.
The ranges are inclusive, but the partial overlap check uses exclusive
comparisons. This skips ranges with base == loc_end or end == loc_base.
Use inclusive comparisons instead.
Fixes: 7c64e21a1c5a ("powerpc/kexec_file: Restrict memory usage of kdump kernel")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
arch/powerpc/kexec/file_load_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 8c72e12ea44e..f9e872693ca7 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -113,7 +113,7 @@ static int add_usable_mem(struct umem_info *um_info, u64 base, u64 end)
loc_end = um_info->ranges[i].end;
if (loc_base >= base && loc_end <= end)
add = true;
- else if (base < loc_end && end > loc_base) {
+ else if (base <= loc_end && end >= loc_base) {
if (loc_base < base)
loc_base = base;
if (loc_end > end)
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2026-08-09 16:24 [PATCH] powerpc/kexec_file: Use inclusive range checks in add_usable_mem() Thorsten Blum
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