6.17-stable review patch. If anyone has any objections, please let me know.
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From: Dave Jiang dave.jiang@intel.com
[ Upstream commit f4d027921c811ff7fc16e4d03c6bbbf4347cf37a ]
match_region_by_range() is not using the helper function that also takes extended linear cache size into account when comparing regions. This causes a x2 region to show up as 2 partial incomplete regions rather than a single CXL region with extended linear cache support. Replace the open coded compare logic with the proper helper function for comparison. User visible impact is that when 'cxl list' is issued, no activa CXL region(s) are shown. There may be multiple idle regions present. No actual active CXL region is present in the kernel.
[dj: Fix stable address]
Fixes: 0ec9849b6333 ("acpi/hmat / cxl: Add extended linear cache support for CXL") Cc: stable@vger.kernel.org Reviewed-by: Gregory Price gourry@gourry.net Reviewed-by: Alison Schofield alison.schofield@intel.com Reviewed-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Dave Jiang dave.jiang@intel.com [ constify struct range ] Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cxl/core/region.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
--- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -831,7 +831,7 @@ static int match_free_decoder(struct dev }
static bool region_res_match_cxl_range(const struct cxl_region_params *p, - struct range *range) + const struct range *range) { if (!p->res) return false; @@ -3287,10 +3287,7 @@ static int match_region_by_range(struct p = &cxlr->params;
guard(rwsem_read)(&cxl_rwsem.region); - if (p->res && p->res->start == r->start && p->res->end == r->end) - return 1; - - return 0; + return region_res_match_cxl_range(p, r); }
static int cxl_extended_linear_cache_resize(struct cxl_region *cxlr,