xen-devel.lists.xenproject.org archive mirror
 help / color / mirror / Atom feed
From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Jan Beulich" <JBeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>
Subject: [PATCH 2/7] x86/shim: Fix compilation at -Og
Date: Mon, 19 Apr 2021 15:01:27 +0100	[thread overview]
Message-ID: <20210419140132.16909-3-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <20210419140132.16909-1-andrew.cooper3@citrix.com>

When compiling at -Og:

  shim.c: In function ‘write_start_info’:
  shim.c:288:22: error: ‘param’ may be used uninitialized in this function[-Werror=maybe-uninitialized]
       si->store_evtchn = param;
       ~~~~~~~~~~~~~~~~~^~~~~~~

and a slew of knock-on failures.  All are caused by
xen_hypercall_hvm_get_param(), and presumably insufficient analysis to observe
that *value is always written on the ret=0 path.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Wei Liu <wl@xen.org>
---
 xen/arch/x86/pv/shim.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c
index d16c0048c0..a05aaa7bcc 100644
--- a/xen/arch/x86/pv/shim.c
+++ b/xen/arch/x86/pv/shim.c
@@ -282,7 +282,7 @@ static void write_start_info(struct domain *d)
     struct cpu_user_regs *regs = guest_cpu_user_regs();
     start_info_t *si = map_domain_page(_mfn(is_pv_32bit_domain(d) ? regs->edx
                                                                   : regs->rdx));
-    uint64_t param;
+    uint64_t param = 0;
 
     snprintf(si->magic, sizeof(si->magic), "xen-3.0-x86_%s",
              is_pv_32bit_domain(d) ? "32p" : "64");
@@ -311,8 +311,8 @@ int pv_shim_shutdown(uint8_t reason)
     struct domain *d = current->domain;
     struct vcpu *v;
     unsigned int i;
-    uint64_t old_store_pfn, old_console_pfn = 0, store_pfn, console_pfn;
-    uint64_t store_evtchn, console_evtchn;
+    uint64_t old_store_pfn = 0, old_console_pfn = 0, store_pfn = 0, console_pfn = 0;
+    uint64_t store_evtchn = 0, console_evtchn = 0;
     long rc;
 
     if ( reason != SHUTDOWN_suspend )
-- 
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 ` Andrew Cooper [this message]
2021-04-19 14:01 ` [PATCH 3/7] x86/sysctl: Make arch_do_sysctl() " 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 ` [PATCH 6/7] x86/shadow: Make _shadow_prealloc() " Andrew Cooper
2021-04-22  7:52   ` 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210419140132.16909-3-andrew.cooper3@citrix.com \
    --to=andrew.cooper3@citrix.com \
    --cc=JBeulich@suse.com \
    --cc=roger.pau@citrix.com \
    --cc=wl@xen.org \
    --cc=xen-devel@lists.xenproject.org \
    --subject='Re: [PATCH 2/7] x86/shim: Fix compilation at -Og' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).