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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Tim Deegan" <tim@xen.org>, "Jan Beulich" <JBeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>
Subject: [PATCH 6/7] x86/shadow: Make _shadow_prealloc() compile at -Og
Date: Mon, 19 Apr 2021 15:01:31 +0100	[thread overview]
Message-ID: <20210419140132.16909-7-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <20210419140132.16909-1-andrew.cooper3@citrix.com>

When compiling at -Og:

  In file included from
  /builds/xen-project/people/andyhhp/xen/xen/include/asm/domain.h:4:0,
                   from /builds/xen-project/people/andyhhp/xen/xen/include/xen/domain.h:8,
                   from /builds/xen-project/people/andyhhp/xen/xen/include/xen/sched.h:11,
                   from /builds/xen-project/people/andyhhp/xen/xen/include/xen/ioreq.h:22,
                   from common.c:23:
  common.c: In function '_shadow_prealloc':
  /builds/xen-project/people/andyhhp/xen/xen/include/xen/mm.h:252:55: error: 't' may be used uninitialized in this function [-Werror=maybe-uninitialized]
       return page != head->next ? pdx_to_page(page->list.prev) : NULL;
                                                         ^
  common.c:933:28: note: 't' was declared here
       struct page_info *sp, *t;
                              ^

I'm not certain the analysis is correct.  't' is a temporary variable, and is
clearly initialised before use in foreach_pinned_shadow().  Either way,
initialising it to NULL placates the compiler.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Tim Deegan <tim@xen.org>
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Wei Liu <wl@xen.org>
---
 xen/arch/x86/mm/shadow/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index b99ca14e71..737e6b365a 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -931,7 +931,7 @@ static inline void trace_shadow_prealloc_unpin(struct domain *d, mfn_t smfn)
 static void _shadow_prealloc(struct domain *d, unsigned int pages)
 {
     struct vcpu *v;
-    struct page_info *sp, *t;
+    struct page_info *sp, *t = NULL;
     mfn_t smfn;
     int i;
 
-- 
2.11.0



  parent reply	other threads:[~2021-04-19 14:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 14:01 [PATCH 0/7] xen: Switch to using -Og for debug builds Andrew Cooper
2021-04-19 14:01 ` [PATCH 1/7] xen/arm: Make make_cpus_node() compile at -Og Andrew Cooper
2021-04-22 18:20   ` Julien Grall
2021-04-19 14:01 ` [PATCH 2/7] x86/shim: Fix compilation " Andrew Cooper
2021-04-19 14:01 ` [PATCH 3/7] x86/sysctl: Make arch_do_sysctl() compile " Andrew Cooper
2021-04-19 14:01 ` [PATCH 4/7] x86/irq: Make create_irq() " Andrew Cooper
2021-04-19 14:01 ` [PATCH 5/7] xen/efi: Make efi_start() " Andrew Cooper
2021-04-19 14:01 ` Andrew Cooper [this message]
2021-04-22  7:52   ` [PATCH 6/7] x86/shadow: Make _shadow_prealloc() " Tim Deegan
2021-04-19 14:01 ` [PATCH 7/7] xen: Use -Og for debug builds when available Andrew Cooper
2021-04-19 15:45 ` [PATCH 0/7] xen: Switch to using -Og for debug builds Jan Beulich
2021-04-21  9:31   ` Andrew Cooper
2021-04-21  9:51     ` Jan Beulich

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