From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Andrew Morton <akpm@linux-foundation.org>, arnd@arndb.de
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-arch@vger.kernel.org,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Subject: [PATCH v2 2/4] mm: Make generic arch_is_kernel_initmem_freed() do what it says
Date: Tue, 28 Sep 2021 09:15:35 +0200 [thread overview]
Message-ID: <ec69cc95a98548c862c22b742936244fdb0c7984.1632813331.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <ffa99e8e91e756b081427b27e408f275b7d43df7.1632813331.git.christophe.leroy@csgroup.eu>
Commit 7a5da02de8d6 ("locking/lockdep: check for freed initmem in
static_obj()") added arch_is_kernel_initmem_freed() which is supposed
to report whether an object is part of already freed init memory.
For the time being, the generic version of arch_is_kernel_initmem_freed()
always reports 'false', allthough free_initmem() is generically called
on all architectures.
Therefore, change the generic version of arch_is_kernel_initmem_freed()
to check whether free_initmem() has been called. If so, then check
if a given address falls into init memory.
In order to use function init_section_contains(), the fonction is
moved at the end of asm-generic/section.h
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
v2: Change to using the new SYSTEM_FREEING_INITMEM state
---
include/asm-generic/sections.h | 31 +++++++++++++++++--------------
1 file changed, 17 insertions(+), 14 deletions(-)
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index d16302d3eb59..13f301239007 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -80,20 +80,6 @@ static inline int arch_is_kernel_data(unsigned long addr)
}
#endif
-/*
- * Check if an address is part of freed initmem. This is needed on architectures
- * with virt == phys kernel mapping, for code that wants to check if an address
- * is part of a static object within [_stext, _end]. After initmem is freed,
- * memory can be allocated from it, and such allocations would then have
- * addresses within the range [_stext, _end].
- */
-#ifndef arch_is_kernel_initmem_freed
-static inline int arch_is_kernel_initmem_freed(unsigned long addr)
-{
- return 0;
-}
-#endif
-
/**
* memory_contains - checks if an object is contained within a memory region
* @begin: virtual address of the beginning of the memory region
@@ -172,4 +158,21 @@ static inline bool is_kernel_rodata(unsigned long addr)
addr < (unsigned long)__end_rodata;
}
+/*
+ * Check if an address is part of freed initmem. This is needed on architectures
+ * with virt == phys kernel mapping, for code that wants to check if an address
+ * is part of a static object within [_stext, _end]. After initmem is freed,
+ * memory can be allocated from it, and such allocations would then have
+ * addresses within the range [_stext, _end].
+ */
+#ifndef arch_is_kernel_initmem_freed
+static inline int arch_is_kernel_initmem_freed(unsigned long addr)
+{
+ if (system_state < SYSTEM_FREEING_INITMEM)
+ return 0;
+
+ return init_section_contains((void *)addr, 1);
+}
+#endif
+
#endif /* _ASM_GENERIC_SECTIONS_H_ */
--
2.31.1
next prev parent reply other threads:[~2021-09-28 7:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-28 7:15 [PATCH v2 1/4] mm: Create a new system state and fix core_kernel_text() Christophe Leroy
2021-09-28 7:15 ` Christophe Leroy [this message]
2021-09-29 3:30 ` [PATCH v2 2/4] mm: Make generic arch_is_kernel_initmem_freed() do what it says Andrew Morton
2021-09-28 7:15 ` [PATCH v2 3/4] powerpc: Use generic version of arch_is_kernel_initmem_freed() Christophe Leroy
2021-09-28 7:15 ` [PATCH v2 4/4] s390: " Christophe Leroy
2021-09-28 9:45 ` Heiko Carstens
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