linux-kernel - [RFC PATCH 6/9] mm: export-GPL get_pageblock

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Message-Id: <20200409193543.18115-7-mathieu.desnoyers@efficios.com>
Date:   Thu,  9 Apr 2020 15:35:40 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, akpm@...ux-foundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, rostedt@...dmis.org,
        Alexei Starovoitov <ast@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-mm@...ck.org
Subject: [RFC PATCH 6/9] mm: export-GPL get_pageblock_migratetype

The macro include/linux/mmzone.h:get_pageblock_migratetype() uses
the symbol get_pfnblock_flags_mask, which is not exported. That macro is
used within the kmem and page_ref trace events to trace the migrate type
of the target page.

Exporting this symbol to GPL modules allows GPL kernel tracers to be
implemented as modules.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mm@...ck.org
---
 mm/page_alloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 114c56c3685d..390febb028a0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -501,6 +501,7 @@ unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn,
 {
 	return __get_pfnblock_flags_mask(page, pfn, end_bitidx, mask);
 }
+EXPORT_SYMBOL_GPL(get_pfnblock_flags_mask);
 
 static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn)
 {
-- 
2.17.1