s390/kasan: add support for mem= kernel parameter

Handle mem= kernel parameter in kasan to limit physical memory.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/kasan_init.c b/arch/s390/mm/kasan_init.c
index 5b253247bc9723d6e133c7b170d3cdfff11fac7b..55982142b2b5bd5b91c73a7c4a0e4b39e1fec016 100644 (file)
--- a/arch/s390/mm/kasan_init.c
+++ b/arch/s390/mm/kasan_init.c
@@ -268,6 +268,9 @@ void __init kasan_early_init(void)
        memsize = get_mem_detect_end();
        if (!memsize)
                kasan_early_panic("cannot detect physical memory size\n");
+       /* respect mem= cmdline parameter */
+       if (memory_end_set && memsize > memory_end)
+               memsize = memory_end;
        memsize = min(memsize, KASAN_SHADOW_START);
 
        if (IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)) {