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| author | Ratheesh Kannoth <rkannoth@marvell.com> | 2026-05-21 12:52:57 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-05-26 00:03:06 +0300 |
| commit | d603517771d8e08a2d8fc9e1f7682ce393d3973a (patch) | |
| tree | d897f11904b5bc3fa34638e846a9b9df7c00abcf /include | |
| parent | e57516529a5bd9e228d1cd80b460fbc1c34bbea4 (diff) | |
| download | linux-d603517771d8e08a2d8fc9e1f7682ce393d3973a.tar.xz | |
devlink: pass param values by pointer
union devlink_param_value grows substantially once U64 array
parameters are added to devlink (from 32 bytes to over 264 bytes).
devlink_nl_param_value_fill_one() and devlink_nl_param_value_put()
copy the union by value in several places. Passing two instances as
value arguments alone consumes over 528 bytes of stack; combined with
deeper call chains the parameter stack can approach 800 bytes and trip
CONFIG_FRAME_WARN more easily.
Switch internal helpers and exported driver APIs to pass pointers to
union devlink_param_value rather than passing the union by value.
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Acked-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Arthur Kiyanovski <akiyano@amazon.com> #for ena
Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260521095303.2395584-4-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/devlink.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/devlink.h b/include/net/devlink.h index bcd31de1f890..5f4083dc4345 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -501,7 +501,7 @@ struct devlink_param { struct devlink_param_gset_ctx *ctx, struct netlink_ext_ack *extack); int (*validate)(struct devlink *devlink, u32 id, - union devlink_param_value val, + union devlink_param_value *val, struct netlink_ext_ack *extack); int (*get_default)(struct devlink *devlink, u32 id, struct devlink_param_gset_ctx *ctx, @@ -1923,7 +1923,7 @@ void devlink_params_unregister(struct devlink *devlink, int devl_param_driverinit_value_get(struct devlink *devlink, u32 param_id, union devlink_param_value *val); void devl_param_driverinit_value_set(struct devlink *devlink, u32 param_id, - union devlink_param_value init_val); + union devlink_param_value *init_val); void devl_param_value_changed(struct devlink *devlink, u32 param_id); struct devlink_region *devl_region_create(struct devlink *devlink, const struct devlink_region_ops *ops, |