@@ -155,7 +155,9 @@ static int ascot2e_write_regs(struct ascot2e_priv *priv,
static int ascot2e_write_reg(struct ascot2e_priv *priv, u8 reg, u8 val)
{
- return ascot2e_write_regs(priv, reg, &val, 1);
+ u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return ascot2e_write_regs(priv, reg, &tmp, 1);
}
static int ascot2e_read_regs(struct ascot2e_priv *priv,
@@ -257,7 +257,9 @@ static int cxd2841er_write_regs(struct cxd2841er_priv *priv,
static int cxd2841er_write_reg(struct cxd2841er_priv *priv,
u8 addr, u8 reg, u8 val)
{
- return cxd2841er_write_regs(priv, addr, reg, &val, 1);
+ u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return cxd2841er_write_regs(priv, addr, reg, &tmp, 1);
}
static int cxd2841er_read_regs(struct cxd2841er_priv *priv,
@@ -331,7 +331,9 @@ static int helene_write_regs(struct helene_priv *priv,
static int helene_write_reg(struct helene_priv *priv, u8 reg, u8 val)
{
- return helene_write_regs(priv, reg, &val, 1);
+ u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return helene_write_regs(priv, reg, &tmp, 1);
}
static int helene_read_regs(struct helene_priv *priv,
@@ -89,7 +89,9 @@ static int horus3a_write_regs(struct horus3a_priv *priv,
static int horus3a_write_reg(struct horus3a_priv *priv, u8 reg, u8 val)
{
- return horus3a_write_regs(priv, reg, &val, 1);
+ u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return horus3a_write_regs(priv, reg, &tmp, 1);
}
static int horus3a_enter_power_save(struct horus3a_priv *priv)
@@ -95,8 +95,9 @@ static int itd1000_read_reg(struct itd1000_state *state, u8 reg)
static inline int itd1000_write_reg(struct itd1000_state *state, u8 r, u8 v)
{
- int ret = itd1000_write_regs(state, r, &v, 1);
- state->shadow[r] = v;
+ u8 tmp = v; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+ int ret = itd1000_write_regs(state, r, &tmp, 1);
+ state->shadow[r] = tmp;
return ret;
}
@@ -142,7 +142,10 @@ static inline int mt312_readreg(struct mt312_state *state,
static inline int mt312_writereg(struct mt312_state *state,
const enum mt312_reg_addr reg, const u8 val)
{
- return mt312_write(state, reg, &val, 1);
+ u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+
+ return mt312_write(state, reg, &tmp, 1);
}
static inline u32 mt312_div(u32 a, u32 b)
@@ -539,7 +539,8 @@ int stb0899_write_regs(struct stb0899_state *state, unsigned int reg, u8 *data,
int stb0899_write_reg(struct stb0899_state *state, unsigned int reg, u8 data)
{
- return stb0899_write_regs(state, reg, &data, 1);
+ u8 tmp = data;
+ return stb0899_write_regs(state, reg, &tmp, 1);
}
/*
@@ -226,12 +226,14 @@ static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int st
static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
{
+ u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
if (unlikely(reg >= STB6100_NUMREGS)) {
dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
return -EREMOTEIO;
}
- data = (data & stb6100_template[reg].mask) | stb6100_template[reg].set;
- return stb6100_write_reg_range(state, &data, reg, 1);
+ tmp = (tmp & stb6100_template[reg].mask) | stb6100_template[reg].set;
+ return stb6100_write_reg_range(state, &tmp, reg, 1);
}
@@ -166,7 +166,9 @@ int stv0367_writeregs(struct stv0367_state *state, u16 reg, u8 *data, int len)
static int stv0367_writereg(struct stv0367_state *state, u16 reg, u8 data)
{
- return stv0367_writeregs(state, reg, &data, 1);
+ u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return stv0367_writeregs(state, reg, &tmp, 1);
}
static u8 stv0367_readreg(struct stv0367_state *state, u16 reg)
@@ -755,7 +755,9 @@ static int stv090x_write_regs(struct stv090x_state *state, unsigned int reg, u8
static int stv090x_write_reg(struct stv090x_state *state, unsigned int reg, u8 data)
{
- return stv090x_write_regs(state, reg, &data, 1);
+ u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return stv090x_write_regs(state, reg, &tmp, 1);
}
static int stv090x_i2c_gate_ctrl(struct stv090x_state *state, int enable)
@@ -97,7 +97,9 @@ static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 da
static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
{
- return stv6110x_write_regs(stv6110x, reg, &data, 1);
+ u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return stv6110x_write_regs(stv6110x, reg, &tmp, 1);
}
static int stv6110x_init(struct dvb_frontend *fe)
@@ -134,7 +134,9 @@ static inline int zl10039_writereg(struct zl10039_state *state,
const enum zl10039_reg_addr reg,
const u8 val)
{
- return zl10039_write(state, reg, &val, 1);
+ const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return zl10039_write(state, reg, &tmp, 1);
}
static int zl10039_init(struct dvb_frontend *fe)
A typical code fragment was copied across many dvb-frontend drivers and causes large stack frames when built with with CONFIG_KASAN on gcc-5/6/7: drivers/media/dvb-frontends/cxd2841er.c:3225:1: error: the frame size of 3992 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] drivers/media/dvb-frontends/cxd2841er.c:3404:1: error: the frame size of 3136 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] drivers/media/dvb-frontends/stv0367.c:3143:1: error: the frame size of 4016 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] drivers/media/dvb-frontends/stv090x.c:3430:1: error: the frame size of 5312 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] drivers/media/dvb-frontends/stv090x.c:4248:1: error: the frame size of 4872 bytes is larger than 3072 bytes [-Werror=frame-larger-than=] gcc-8 now solves this by consolidating the stack slots for the argument variables, but on older compilers we can get the same behavior by taking the pointer of a local variable rather than the inline function argument. Cc: stable@vger.kernel.org Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- v2: add a comment for each instance of the problem, linking to the gcc bugzilla (I left out the http:// so it would fit in one line) --- drivers/media/dvb-frontends/ascot2e.c | 4 +++- drivers/media/dvb-frontends/cxd2841er.c | 4 +++- drivers/media/dvb-frontends/helene.c | 4 +++- drivers/media/dvb-frontends/horus3a.c | 4 +++- drivers/media/dvb-frontends/itd1000.c | 5 +++-- drivers/media/dvb-frontends/mt312.c | 5 ++++- drivers/media/dvb-frontends/stb0899_drv.c | 3 ++- drivers/media/dvb-frontends/stb6100.c | 6 ++++-- drivers/media/dvb-frontends/stv0367.c | 4 +++- drivers/media/dvb-frontends/stv090x.c | 4 +++- drivers/media/dvb-frontends/stv6110x.c | 4 +++- drivers/media/dvb-frontends/zl10039.c | 4 +++- 12 files changed, 37 insertions(+), 14 deletions(-)