File systemtap-fix-get_user_pages_remote-test-for-4.... of Package systemtap-docs

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File systemtap-fix-get_user_pages_remote-test-for-4.10-rc0-kernels.patch of Package systemtap-docs

From: Frank Ch. Eigler <fche@redhat.com>
Date: Mon Dec 26 10:39:09 2016 -0500
Subject:  Fix get_user_pages_remote() test for 4.10-rc0 kernels.
Git-commit: 2676bba61284109b8f6f96921667613c15398a07
References: bsc#1031409
Signed-off-by: Tony Jones <tonyj@suse.de>

Fix get_user_pages_remote() test for 4.10-rc0 kernels.
    
    This kernel API is undergoing considerable flux.

diff --git a/buildrun.cxx b/buildrun.cxx
index f5019b925..aaea64cb1 100644
--- a/buildrun.cxx
+++ b/buildrun.cxx
@@ -450,6 +450,8 @@ compile_pass (systemtap_session& s)
   output_exportconf(s, o, "get_user_pages_remote", "STAPCONF_GET_USER_PAGES_REMOTE");
   output_autoconf(s, o, "autoconf-get_user_pages_remote-flags.c",
 		  "STAPCONF_GET_USER_PAGES_REMOTE_FLAGS", NULL);
+  output_autoconf(s, o, "autoconf-get_user_pages_remote-flags_locked.c",
+		  "STAPCONF_GET_USER_PAGES_REMOTE_FLAGS_LOCKED", NULL);
 
   o << module_cflags << " += -include $(STAPCONF_HEADER)" << endl;
 
diff --git a/runtime/linux/access_process_vm.h b/runtime/linux/access_process_vm.h
index d9400d723..22a12207a 100644
--- a/runtime/linux/access_process_vm.h
+++ b/runtime/linux/access_process_vm.h
@@ -33,15 +33,20 @@ __access_process_vm_ (struct task_struct *tsk, unsigned long addr, void *buf,
       void *maddr;
 
 #ifdef STAPCONF_GET_USER_PAGES_REMOTE
-#ifdef STAPCONF_GET_USER_PAGES_REMOTE_FLAGS
+#if defined(STAPCONF_GET_USER_PAGES_REMOTE_FLAGS_LOCKED)
+      unsigned int flags = FOLL_FORCE;
+      if (write)
+	  flags |= FOLL_WRITE;
+      ret = get_user_pages_remote (tsk, mm, addr, 1, flags, &page, &vma, NULL);
+#elif defined(STAPCONF_GET_USER_PAGES_REMOTE_FLAGS)
       unsigned int flags = FOLL_FORCE;
       if (write)
 	  flags |= FOLL_WRITE;
       ret = get_user_pages_remote (tsk, mm, addr, 1, flags, &page, &vma);
-#else  /* !STAPCONF_GET_USER_PAGES_REMOTE_FLAGS */
-      ret = get_user_pages_remote (tsk, mm, addr, 1, write, 1, &page, &vma);
-#endif /* !STAPCONF_GET_USER_PAGES_REMOTE_FLAGS */
 #else
+      ret = get_user_pages_remote (tsk, mm, addr, 1, write, 1, &page, &vma);
+#endif
+#else /* !STAPCONF_GET_USER_PAGES_REMOTE* */
       ret = get_user_pages (tsk, mm, addr, 1, write, 1, &page, &vma);
 #endif
       if (ret <= 0)
diff --git a/runtime/linux/autoconf-get_user_pages_remote-flags_locked.c b/runtime/linux/autoconf-get_user_pages_remote-flags_locked.c
new file mode 100644
index 000000000..bb9b56717
--- /dev/null
+++ b/runtime/linux/autoconf-get_user_pages_remote-flags_locked.c
@@ -0,0 +1,33 @@
+#include <linux/mm.h>
+
+//
+// The following kernel commit changed the get_user_pages_remote()
+// function signature:
+//
+// commit 5b56d49fc31dbb0487e14ead790fc81ca9fb2c99
+// Author: Lorenzo Stoakes <lstoakes@gmail.com>
+// Date:   Wed Dec 14 15:06:52 2016 -0800
+// 
+// mm: add locked parameter to get_user_pages_remote()
+//        
+// This changed the function signature from:
+//
+// long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+//                            unsigned long start, unsigned long nr_pages,
+//                            unsigned int gup_flags, struct page **pages,
+//                            struct vm_area_struct **vmas);
+//
+// long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
+//                            unsigned long start, unsigned long nr_pages,
+//                            unsigned int gup_flags, struct page **pages,
+//                            struct vm_area_struct **vmas, int *locked);
+//
+
+long gupr_wrapper2(struct task_struct *tsk, struct mm_struct *mm,
+                   unsigned long start, unsigned long nr_pages,
+                   unsigned int gup_flags, struct page **pages,
+                   struct vm_area_struct **vmas, int *locked)
+{
+    return get_user_pages_remote(tsk, mm, start, nr_pages, gup_flags,
+				 pages, vmas, locked);
+}

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File systemtap-fix-get_user_pages_remote-test-for-4.10-rc0-kernels.patch of Package systemtap-docs

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