6.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx> commit 11684134140bb708b6e6de969a060535630b1b53 upstream. set_memmap_mode() stores the kernel parameter memmap mode as an integer. However, the get_memmap_mode() function utilizes param_get_bool() to fetch the value as a boolean, leading to potential endianness issue. On Big-endian architectures, the memmap_on_memory is consistently displayed as 'N' regardless of its actual status. To address this endianness problem, the solution involves obtaining the mode as an integer. This adjustment ensures the proper display of the memmap_on_memory parameter, presenting it as one of the following options: Force, Y, or N. Link: https://lkml.kernel.org/r/20240110140127.241451-1-sumanthk@xxxxxxxxxxxxx Fixes: 2d1f649c7c08 ("mm/memory_hotplug: support memmap_on_memory when memmap is not aligned to pageblocks") Signed-off-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx> Suggested-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx> Acked-by: David Hildenbrand <david@xxxxxxxxxx> Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx> Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx> Cc: Heiko Carstens <hca@xxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxx> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [6.6+] Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/memory_hotplug.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -101,9 +101,11 @@ static int set_memmap_mode(const char *v static int get_memmap_mode(char *buffer, const struct kernel_param *kp) { - if (*((int *)kp->arg) == MEMMAP_ON_MEMORY_FORCE) - return sprintf(buffer, "force\n"); - return param_get_bool(buffer, kp); + int mode = *((int *)kp->arg); + + if (mode == MEMMAP_ON_MEMORY_FORCE) + return sprintf(buffer, "force\n"); + return sprintf(buffer, "%c\n", mode ? 'Y' : 'N'); } static const struct kernel_param_ops memmap_mode_ops = {
