From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20120518212649.883305120@linuxfoundation.org> Date: Fri, 18 May 2012 14:26:56 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Meelis Roos , "David S. Miller" Subject: [ 07/47] sparc64: Do not clobber %g2 in xcall_fetch_glob_regs(). In-Reply-To: <20120518212701.GA5023@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: "David S. Miller" [ Upstream commit a5a737e090e25981e99d69f01400e3a80356581c ] %g2 is meant to hold the CPUID number throughout this routine, since at the very beginning, and at the very end, we use %g2 to calculate indexes into per-cpu arrays. However we erroneously clobber it in order to hold the %cwp register value mid-stream. Fix this code to use %g3 for the %cwp read and related calulcations instead. Reported-by: Meelis Roos Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- arch/sparc/kernel/central.c | 2 +- arch/sparc/mm/ultra.S | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) --- a/arch/sparc/kernel/central.c +++ b/arch/sparc/kernel/central.c @@ -269,4 +269,4 @@ static int __init sunfire_init(void) return 0; } -subsys_initcall(sunfire_init); +fs_initcall(sunfire_init); --- a/arch/sparc/mm/ultra.S +++ b/arch/sparc/mm/ultra.S @@ -495,11 +495,11 @@ xcall_fetch_glob_regs: stx %o7, [%g1 + GR_SNAP_O7] stx %i7, [%g1 + GR_SNAP_I7] /* Don't try this at home kids... */ - rdpr %cwp, %g2 - sub %g2, 1, %g7 + rdpr %cwp, %g3 + sub %g3, 1, %g7 wrpr %g7, %cwp mov %i7, %g7 - wrpr %g2, %cwp + wrpr %g3, %cwp stx %g7, [%g1 + GR_SNAP_RPC] sethi %hi(trap_block), %g7 or %g7, %lo(trap_block), %g7