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kmsan: increase the maximum store size to 4096

The inline assembly block in s390's chsc() stores that much.

Link: https://lkml.kernel.org/r/20240621113706.315500-5-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <kasan-dev@googlegroups.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Ilya Leoshkevich and committed by
Andrew Morton 95044e1d 854fa98d

+3 -4
+3 -4
mm/kmsan/instrumentation.c
··· 110 110 111 111 ua_flags = user_access_save(); 112 112 /* 113 - * Most of the accesses are below 32 bytes. The two exceptions so far 114 - * are clwb() (64 bytes) and FPU state (512 bytes). 115 - * It's unlikely that the assembly will touch more than 512 bytes. 113 + * Most of the accesses are below 32 bytes. The exceptions so far are 114 + * clwb() (64 bytes), FPU state (512 bytes) and chsc() (4096 bytes). 116 115 */ 117 - if (size > 512) { 116 + if (size > 4096) { 118 117 WARN_ONCE(1, "assembly store size too big: %ld\n", size); 119 118 size = 8; 120 119 }