Commit-ID: 32206ab36553be8714d9253ce33f4085681d369c
Gitweb: https://git.kernel.org/tip/32206ab36553be8714d9253ce33f4085681d369c
Author: Reinette Chatre <reinette.chatre@xxxxxxxxx>
AuthorDate: Fri, 22 Jun 2018 15:41:52 -0700
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 23 Jun 2018 12:53:19 +0200
x86/intel_rdt: Provide pseudo-locking hooks within rdt_mount
Stephen Rothwell reported that the Cache Pseudo-Locking enabling and the
kernfs support for mounting with fs_context are conflicting.
In preparation for a conflict-free merge between the two repos some no-op
hooks are created within the RDT mount function being changed by the two
features. The goal is for this commit to be placed on a minimal no-rebase
branch to be consumed by both features.
Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Suggested-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: fenghua.yu@xxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Cc: vikas.shivappa@xxxxxxxxxxxxxxx
Cc: gavin.hindman@xxxxxxxxx
Cc: jithu.joseph@xxxxxxxxx
Cc: dave.hansen@xxxxxxxxx
Cc: hpa@xxxxxxxxx
Cc: David Howells <dhowells@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/410697ead08978bd12111c0afc4ce9e7bd71a5fe.1529706536.git.reinette.chatre@xxxxxxxxx
---
arch/x86/kernel/cpu/intel_rdt.h | 9 +++++++++
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 10 +++++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 39752825e376..be152b3b2543 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -468,4 +468,13 @@ void cqm_handle_limbo(struct work_struct *work);
bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
void __check_limbo(struct rdt_domain *d, bool force_free);
+/*
+ * Define the hooks for Cache Pseudo-Locking to use within rdt_mount().
+ * These are no-ops provided for the new kernfs changes to use as a
+ * baseline in preparation for a conflict-free merge between it
+ * (kernfs changes) and the Cache Pseudo-Locking enabling.
+ */
+static inline int rdt_pseudo_lock_init(void) { return 0; }
+static inline void rdt_pseudo_lock_release(void) { }
+
#endif /* _ASM_X86_INTEL_RDT_H */
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 749856a2e736..fa668f967062 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1289,10 +1289,16 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
rdtgroup_default.mon.mon_data_kn = kn_mondata;
}
+ ret = rdt_pseudo_lock_init();
+ if (ret) {
+ dentry = ERR_PTR(ret);
+ goto out_mondata;
+ }
+
dentry = kernfs_mount(fs_type, flags, rdt_root,
RDTGROUP_SUPER_MAGIC, NULL);
if (IS_ERR(dentry))
- goto out_mondata;
+ goto out_psl;
if (rdt_alloc_capable)
static_branch_enable_cpuslocked(&rdt_alloc_enable_key);
@@ -1310,6 +1316,8 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
goto out;
+out_psl:
+ rdt_pseudo_lock_release();
out_mondata:
if (rdt_mon_capable)
kernfs_remove(kn_mondata);
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|