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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488cf9e8ab4sm36505175e9.4.2026.04.09.00.26.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Apr 2026 00:26:13 -0700 (PDT) Date: Thu, 9 Apr 2026 08:26:11 +0100 From: David Laight To: Andy Shevchenko Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Lukas Wunner , Andrew Morton Subject: Re: [PATCH v3 1/1] mtd: cfi_cmdset_0001: Factor out do_write_buffer_locked() to reduce stack frame Message-ID: <20260409082611.73fac9ab@pumpkin> In-Reply-To: <20260408211407.2295175-1-andriy.shevchenko@linux.intel.com> References: <20260408211407.2295175-1-andriy.shevchenko@linux.intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Wed, 8 Apr 2026 23:11:48 +0200 Andy Shevchenko wrote: > Compiler is not happy about used stack frame: >=20 > drivers/mtd/chips/cfi_cmdset_0001.c: In function 'do_write_buffer': > drivers/mtd/chips/cfi_cmdset_0001.c:1887:1: error: the frame size of 1296= bytes is larger than 1280 bytes [-Werror=3Dframe-larger-than=3D] >=20 > Fix this by factoring out do_write_buffer_locked(). Does this just split the large stack frame between two nested functions? I'd also expect the compiler to inline do_write_buffer_locked() so it makes little difference. OTOH I can't immediately see where the large stack frame comes from. David >=20 > Signed-off-by: Andy Shevchenko > --- > v3: addressed set but unused variables when MTD_XIP=3Dy (LKP) > v2: kept DIS/ENABLE_VPP paired >=20 > drivers/mtd/chips/cfi_cmdset_0001.c | 88 +++++++++++++++++------------ > 1 file changed, 51 insertions(+), 37 deletions(-) >=20 > diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_= cmdset_0001.c > index 5a4d2e16a9d1..7733e076ad40 100644 > --- a/drivers/mtd/chips/cfi_cmdset_0001.c > +++ b/drivers/mtd/chips/cfi_cmdset_0001.c > @@ -1154,7 +1154,8 @@ static void __xipram xip_enable(struct map_info *ma= p, struct flchip *chip, > =20 > static int __xipram xip_wait_for_operation( > struct map_info *map, struct flchip *chip, > - unsigned long adr, unsigned int chip_op_time_max) > + unsigned long adr, unsigned long inval_adr, int inval_len, > + unsigned int chip_op_time, unsigned int chip_op_time_max) > { > struct cfi_private *cfi =3D map->fldrv_priv; > struct cfi_pri_intelext *cfip =3D cfi->cmdset_priv; > @@ -1276,8 +1277,7 @@ static int __xipram xip_wait_for_operation( > #define XIP_INVAL_CACHED_RANGE(map, from, size) \ > INVALIDATE_CACHED_RANGE(map, from, size) > =20 > -#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, u= sec, usec_max) \ > - xip_wait_for_operation(map, chip, cmd_adr, usec_max) > +#define INVAL_CACHE_AND_WAIT xip_wait_for_operation Isn't that separate and unrelated? The compiler might optimise away the parameters you are adding back. David > =20 > #else > =20 > @@ -1720,42 +1720,24 @@ static int cfi_intelext_write_words (struct mtd_i= nfo *mtd, loff_t to , size_t le > } > =20 > =20 > -static int __xipram do_write_buffer(struct map_info *map, struct flchip = *chip, > - unsigned long adr, const struct kvec **pvec, > - unsigned long *pvec_seek, int len) > +static int __xipram do_write_buffer_locked(struct map_info *map, struct = flchip *chip, > + unsigned long cmd_adr, unsigned long adr, > + const struct kvec **pvec, > + unsigned long *pvec_seek, int len) > { > struct cfi_private *cfi =3D map->fldrv_priv; > map_word status, write_cmd, datum; > - unsigned long cmd_adr; > - int ret, wbufsize, word_gap, words; > + int ret, word_gap, words; > const struct kvec *vec; > unsigned long vec_seek; > unsigned long initial_adr; > int initial_len =3D len; > =20 > - wbufsize =3D cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize; > - adr +=3D chip->start; > initial_adr =3D adr; > - cmd_adr =3D adr & ~(wbufsize-1); > - > - /* Sharp LH28F640BF chips need the first address for the > - * Page Buffer Program command. See Table 5 of > - * LH28F320BF, LH28F640BF, LH28F128BF Series (Appendix FUM00701) */ > - if (is_LH28F640BF(cfi)) > - cmd_adr =3D adr; > =20 > /* Let's determine this according to the interleave only once */ > write_cmd =3D (cfi->cfiq->P_ID !=3D P_ID_INTEL_PERFORMANCE) ? CMD(0xe8)= : CMD(0xe9); > =20 > - mutex_lock(&chip->mutex); > - ret =3D get_chip(map, chip, cmd_adr, FL_WRITING); > - if (ret) { > - mutex_unlock(&chip->mutex); > - return ret; > - } > - > - XIP_INVAL_CACHED_RANGE(map, initial_adr, initial_len); > - ENABLE_VPP(map); > xip_disable(map, chip, cmd_adr); > =20 > /* =C2=A74.8 of the 28FxxxJ3A datasheet says "Any time SR.4 and/or SR.5= is set > @@ -1789,7 +1771,7 @@ static int __xipram do_write_buffer(struct map_info= *map, struct flchip *chip, > xip_enable(map, chip, cmd_adr); > printk(KERN_ERR "%s: Chip not ready for buffer write. Xstatus =3D %lx,= status =3D %lx\n", > map->name, Xstatus.x[0], status.x[0]); > - goto out; > + return ret; > } > =20 > /* Figure out the number of words to write */ > @@ -1853,7 +1835,7 @@ static int __xipram do_write_buffer(struct map_info= *map, struct flchip *chip, > chip->state =3D FL_STATUS; > xip_enable(map, chip, cmd_adr); > printk(KERN_ERR "%s: buffer write error (status timeout)\n", map->name= ); > - goto out; > + return ret; > } > =20 > /* check for errors */ > @@ -1866,21 +1848,53 @@ static int __xipram do_write_buffer(struct map_in= fo *map, struct flchip *chip, > map_write(map, CMD(0x70), cmd_adr); > xip_enable(map, chip, cmd_adr); > =20 > - if (chipstatus & 0x02) { > - ret =3D -EROFS; > - } else if (chipstatus & 0x08) { > + if (chipstatus & 0x02) > + return -EROFS; > + > + if (chipstatus & 0x08) { > printk(KERN_ERR "%s: buffer write error (bad VPP)\n", map->name); > - ret =3D -EIO; > - } else { > - printk(KERN_ERR "%s: buffer write error (status 0x%lx)\n", map->name,= chipstatus); > - ret =3D -EINVAL; > + return -EIO; > } > =20 > - goto out; > + printk(KERN_ERR "%s: buffer write error (status 0x%lx)\n", map->name, = chipstatus); > + return -EINVAL; > } > =20 > xip_enable(map, chip, cmd_adr); > - out: DISABLE_VPP(map); > + return 0; > +} > + > +static int __xipram do_write_buffer(struct map_info *map, struct flchip = *chip, > + unsigned long adr, const struct kvec **pvec, > + unsigned long *pvec_seek, int len) > +{ > + struct cfi_private *cfi =3D map->fldrv_priv; > + unsigned long cmd_adr; > + int ret, wbufsize; > + > + wbufsize =3D cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize; > + adr +=3D chip->start; > + cmd_adr =3D adr & ~(wbufsize - 1); > + > + /* Sharp LH28F640BF chips need the first address for the > + * Page Buffer Program command. See Table 5 of > + * LH28F320BF, LH28F640BF, LH28F128BF Series (Appendix FUM00701) */ > + if (is_LH28F640BF(cfi)) > + cmd_adr =3D adr; > + > + mutex_lock(&chip->mutex); > + ret =3D get_chip(map, chip, cmd_adr, FL_WRITING); > + if (ret) { > + mutex_unlock(&chip->mutex); > + return ret; > + } > + > + XIP_INVAL_CACHED_RANGE(map, adr, len); > + ENABLE_VPP(map); > + > + ret =3D do_write_buffer_locked(map, chip, cmd_adr, adr, pvec, pvec_seek= , len); > + > + DISABLE_VPP(map); > put_chip(map, chip, cmd_adr); > mutex_unlock(&chip->mutex); > return ret;