From: Gal Pressman Date: Mon, 12 Jan 2026 17:37:15 +0000 (+0200) Subject: selftests: drv-net: fix RPS mask handling for high CPU numbers X-Git-Tag: v6.12.67~105 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e9d2b422fb68ad46fbb595c996453b797636250;p=thirdparty%2Fkernel%2Fstable.git selftests: drv-net: fix RPS mask handling for high CPU numbers [ Upstream commit cf055f8c000445aa688c53a706ef4f580818eedb ] The RPS bitmask bounds check uses ~(RPS_MAX_CPUS - 1) which equals ~15 = 0xfff0, only allowing CPUs 0-3. Change the mask to ~((1UL << RPS_MAX_CPUS) - 1) = ~0xffff to allow CPUs 0-15. Fixes: 5ebfb4cc3048 ("selftests/net: toeplitz test") Reviewed-by: Nimrod Oren Signed-off-by: Gal Pressman Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260112173715.384843-3-gal@nvidia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- diff --git a/tools/testing/selftests/net/toeplitz.c b/tools/testing/selftests/net/toeplitz.c index 9ba03164d73a6..5099157f01b9a 100644 --- a/tools/testing/selftests/net/toeplitz.c +++ b/tools/testing/selftests/net/toeplitz.c @@ -473,8 +473,8 @@ static void parse_rps_bitmap(const char *arg) bitmap = strtoul(arg, NULL, 0); - if (bitmap & ~(RPS_MAX_CPUS - 1)) - error(1, 0, "rps bitmap 0x%lx out of bounds 0..%lu", + if (bitmap & ~((1UL << RPS_MAX_CPUS) - 1)) + error(1, 0, "rps bitmap 0x%lx out of bounds, max cpu %lu", bitmap, RPS_MAX_CPUS - 1); for (i = 0; i < RPS_MAX_CPUS; i++)