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| author | Bibo Mao <maobibo@loongson.cn> | 2025-03-08 13:51:32 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-13 13:07:40 +0100 |
| commit | e1fce6292ce9734462d1281a63f9d2c357185afb (patch) | |
| tree | ddc6932144326110056f92a72010de1064eb87bd /arch | |
| parent | 242b34f48a377afe4b285b472bd0f17744fca8e8 (diff) | |
| download | linux-e1fce6292ce9734462d1281a63f9d2c357185afb.tar.gz linux-e1fce6292ce9734462d1281a63f9d2c357185afb.tar.bz2 linux-e1fce6292ce9734462d1281a63f9d2c357185afb.zip | |
LoongArch: Set max_pfn with the PFN of the last page
commit c8477bb0a8e7f6b2e47952b403c5cb67a6929e55 upstream.
The current max_pfn equals to zero. In this case, it causes user cannot
get some page information through /proc filesystem such as kpagecount.
The following message is displayed by stress-ng test suite with command
"stress-ng --verbose --physpage 1 -t 1".
# stress-ng --verbose --physpage 1 -t 1
stress-ng: error: [1691] physpage: cannot read page count for address 0x134ac000 in /proc/kpagecount, errno=22 (Invalid argument)
stress-ng: error: [1691] physpage: cannot read page count for address 0x7ffff207c3a8 in /proc/kpagecount, errno=22 (Invalid argument)
stress-ng: error: [1691] physpage: cannot read page count for address 0x134b0000 in /proc/kpagecount, errno=22 (Invalid argument)
...
After applying this patch, the kernel can pass the test.
# stress-ng --verbose --physpage 1 -t 1
stress-ng: debug: [1701] physpage: [1701] started (instance 0 on CPU 3)
stress-ng: debug: [1701] physpage: [1701] exited (instance 0 on CPU 3)
stress-ng: debug: [1700] physpage: [1701] terminated (success)
Cc: stable@vger.kernel.org # 6.8+
Fixes: ff6c3d81f2e8 ("NUMA: optimize detection of memory with no node id assigned by firmware")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/loongarch/kernel/setup.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index 56934fe58170..1fa6a604734e 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -387,6 +387,9 @@ static void __init check_kernel_sections_mem(void) */ static void __init arch_mem_init(char **cmdline_p) { + /* Recalculate max_low_pfn for "mem=xxx" */ + max_pfn = max_low_pfn = PHYS_PFN(memblock_end_of_DRAM()); + if (usermem) pr_info("User-defined physical RAM map overwrite\n"); |