Commit be564840 authored by Mike Rapoport (Microsoft)'s avatar Mike Rapoport (Microsoft) Committed by Andrew Morton
Browse files

kho: allow scratch areas with zero size 

Patch series "kho: fixes and cleanups", v3.

These are small KHO and KHO test fixes and cleanups.


This patch (of 3):

Parsing of kho_scratch parameter treats zero size as an invalid value,
although it should be fine for user to request zero sized scratch area for
some types if scratch memory, when for example there is no need to create
scratch area in the low memory.

Treat zero as a valid value for a scratch area size but reject kho_scratch
parameter that defines no scratch memory at all.

Link: https://lkml.kernel.org/r/20250811082510.4154080-1-rppt@kernel.org
Link: https://lkml.kernel.org/r/20250811082510.4154080-2-rppt@kernel.org


Signed-off-by: default avatarMike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: default avatarPratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ea5e101f

kernel/kexec_handover.c

+6 −1
Original line number Diff line number Diff line
@@ -405,6 +405,7 @@ static int __init kho_parse_scratch_size(char *p) 
{

	size_t len;

	unsigned long sizes[3];

	size_t total_size = 0;

	int i;



	if (!p)
@@ -441,11 +442,15 @@ static int __init kho_parse_scratch_size(char *p) 
		}



		sizes[i] = memparse(p, &endp);

		if (!sizes[i] || endp == p)

		if (endp == p)

			return -EINVAL;

		p = endp;

		total_size += sizes[i];

	}



	if (!total_size)

		return -EINVAL;



	scratch_size_lowmem = sizes[0];

	scratch_size_global = sizes[1];

	scratch_size_pernode = sizes[2];